The NIST Office of Weights and Measures (OWM) presents its first report 2022 NIST Annual Summary of U.S. Legal Metrology Activities report.
This report includes a summary of changes made to NIST Handbook 44 (2021) Specifications, Tolerances and Other Technical Requirements for Commercial Weighing and Measuring Devices, NIST Handbook 130 (2021), Uniform Laws and Regulations in the Areas of Legal Metrology and Engine Fuel Quality, and NIST Handbook 133 (2020), Checking the Net Contents of Packaged Goods. The summary will provide an archival record of proposals and associated actions with the goal of assisting the weights and measures community in consistently interpreting and implementing NIST Handbooks 44, 130, and 133. Each item in this report includes a NIST OWM technical analysis, background information, and a summary of any actions taken on proposed changes to these NIST Handbooks considered in 2022.

This NIST Special Publication (SP 2200-02) as prepared by the NIST Office of Weights and Measures (OWM) represents the inaugural issue of the 2022 NIST Summary of U.S. Legal Metrology Activities related to legal metrology. This publication is part of an ongoing series that will provide information on the status and development of U.S. and international legal metrology documentary standards; SI usage, facilitation, and best practices; and technical guidance and training as provided by NIST OWM. The publications in this subseries also provide additional technical information that may not be provided in the NIST Handbook series.
We envision this annual 2022 NIST Summary of U.S. Legal Metrology Activities (NIST SP 2200-02) document as a central repository and citable source of annual legal metrology and weights and measures program and meeting synopses, technical activity and working group summaries, and other inclusive information that may be relevant to our partners, customers, and U.S. and international stakeholders. This inaugural issue focuses on a summary of changes made to the NIST Handbooks through the National Conference on Weights and Measures and the regional Weights and Measures Associations together with relevant background information of each technical item as described in the NIST OWM technical analysis. Topics for future issues may include (but are not limited to) reports on workshops, conferences and meetings related to particular technical sectors; summaries of NIST OWM training activities and other technical guidance; recommendations for weight and measures field inspectors and other weights and measures professionals; and updates related to laboratory and international legal metrology activities.
We aim to better serve our weights and measures community with this NIST SP 2200-02 Summary, and other publications within the NIST 2200 subseries. We welcome all feedback at any time.
Dr. Katrice A. Lippa
Chief, NIST Office of Weights and Measures

Subject Series List for the Specifications and Tolerances Committee 5

Table B. Voting Results 10

GEN-General Code 11

GEN-22.1 V G.A.1. Commercial and Law-Enforcement Equipment 11

NIST OWM Executive Summary for GEN-22.1 - G.A.1. Commercial and Law-Enforcement Equipment 11

SCL-Scales 20

SCL-20.9 W S.1.1.3. Zero Indication, Load Receiving Elements Separate from Weighing Elements. And Appendix D - Definitions: no load reference value 20

SCL-22.2 A UR.1. Selection Requirements, UR.1.X. Cannabis 24

NIST OWM Executive Summary for SCL-22.2 - UR.1. Selection Requirements, UR.1 X Cannabis 24

LMD - Liquid Measuring Devices 33

LMD-21.1 VC Table S.2.2. Categories of Device and Method of Sealing 33

NIST OWM Executive Summary for LMD-21.1 - Table S.2.2. Categories of Device and Method of Sealing 33

LMD-22.1 VC Table T.2. Accuracy Classes and Tolerances for Liquid Measuring Devices Covered in NIST Handbook 44, Section 3.30 39

NIST OWM Executive Summary for LMD-22.1 - Table T.2. Accuracy Classes and Tolerances for Liquid Measuring Devices Covered in NIST Handbook 44, Section 3.30 40

VTM - Vehicle Tank Meters 45

VTM-18.1 V S.3.1 Diversion of Measured Liquid and S.3.1.1. Means for Clearing the Discharge Hose and UR.2.6. Clearing the Discharge on a multiple-product, single discharge hose. 45

NIST OWM Executive Summary for VTM-18.1 -S.3.1 Diversion of Measured Liquid and S.3.1.1. Means for Clearing the Discharge Hose and UR.2.6. Clearing the Discharge on a multiple-product, single discharge hose 45

VTM-20.2 A Table T.2. Tolerances for Vehicle Mounted Milk Meters 56

NIST OWM Executive Summary for VTM-20.2 - Table T.2. Tolerances for Vehicle Mounted Milk Meters. 57

LPG - Liquified Petroleum Gas and Anhydrous Liquid-Measuring Devices 69

LPG-15.1 D N.3. Test Drafts 69

NIST OWM Executive Summary for LPG-15.1 - N.3. Test Drafts 70

LPG-22.1 VC A.1. General., and Appendix D - Definitions. Liquefied Petroleum Gas Retail Motor Fuel Device 81

NIST OWM Executive Summary for LPG-22.1 -A.1. General., and Appendix D- Definitions. Liquefied Petroleum Gas Retail Motor Fuel Device 82

LPG-22.2 W S.2.6. Zero-Set-Back Interlock, for Stationary Customer-Operated Retail Motor-Fuel Devices, Electronic 86

LPG-22.3 D S.2.5. Zero-Set-Back Interlock., S.2.5.2. Zero -Set-Back Interlock for Stationary Customer-Operated Electronic Retail Motor-Fuel Devices 90

NIST OWM Executive Summary for LPG-22.3 - S.2.5. Zero-Set-Back Interlock., S.2.5.2. Zero -Set-Back Interlock for Stationary Customer -Operated Electronic Retail Motor-Fuel Devices 92

MFM - Mass Flow Meters 98

MFM-15.1 D N.3. Test Drafts 98

NIST OWM Executive Summary for MFM-15.1 - N.3. Test Drafts 99

MFM-22.1 VC Table T.2. Accuracy Classes and Tolerances for Mass Flow Meters 111

NIST OWM Executive Summary for MFM-22.1 - Table T.2. Accuracy Classes and Tolerances for Mass Flow Meters 111

EVF - Electric Vehicle Fueling Systems 114

EVF-21.1 D A.1. General 114

NIST OWM Executive Summary for EVF-21.1 -A.1. General 115

EVF-20.1 VS.1.3.2. EVSE Value of the Smallest Unit 121

NIST OWM Executive Summary for EVF-20.1 -S.1.3.2. EVSE Value of the Smallest Unit.121

EVF-21.5 DT.2. Load Test Tolerances 129

NIST OWM Executive Summary for EVF-21.5 - T.2. Load Test Tolerances 130

EVF-22.1 V Section 3.40. Electric Vehicle Fueling Systems 136

NIST OWM Executive Summary for EVF-22.1 - Section 3.40. Electric Vehicle Fueling Systems 137

TXI -Taximeters 145

TXI-22.1 VC Table S.5. Categories of Device and Methods of Sealing 145

NIST OWM Executive Summary for TXI-22.1 - Table S.5. Categories of Device and Methods of Sealing 146

GMA - Grain Moisture Meters 5.56 (a) 148

GMA-19.1 D Table T.2.1. Acceptance and Maintenance Tolerances Air Oven Method for All Grains and Oil Seeds 148

MDM - Multiple Dimension Measuring Devices 152

MDM-22.1 W S.1.7. Minimum Measurement 152

NIST OWM Executive Summary for MDM-22.1 -S.1.7. Minimum Measurement 152

OTH - Other Items 157

OTH-16.1 D Electric Watthour Meters Code under Development 157

NIST OWM Executive Summary for OTH-16.1 Electric Watthour Meters Code Under Development 157

OTH-22.2 VC Appendix D - Definitions: face 164

NIST OWM Executive Summary for OTH-22.2 - Appendix D - Definitions: face 164

Item Block 1 (B1) Terminology for Testing Standards 167

B1:SCL-18.1 W N.2. Verification (Testing) Standards 167

B1:ABW-18.1W N.2. Verification (Testing) Standards 167

B1: AWS-18.1W N.1.3. Verification (Testing) Standards, N.3.1. Official Tests, UR.4. Testing Standards 167

B1: CLM-18.1 W N.3.2. Transfer Standard Test and T.3. On Tests Using Transfer Standards. 167

B1: CDL-18.1 W N.3.2. Transfer Standard Test, T.3. On Tests Using Transfer Standards 167

B1: HGM-18.1W N.4.1. Master Meter (Transfer) Standard Test, T.4. Tolerance Application on Test Using Transfer Standard Test Method 167

B1: GMM-18.1 W 5.56(a): N.1.1. Air Oven Reference Method Transfer Standards, N.1.3. Meter to Like-Type Meter Method Transfer Standards and 5,56(b): N.1.1. Transfer Standards, T. Tolerances1 167

B1: LVS-18.1 W N.2. Testing Standards 167

B1: OTH-18.1 W Appendix A: Fundamental Considerations, 3.2. Tolerances for Standards, 3.3. Accuracy of Standards 167

B1: OTH-18.2 W Appendix D - Definitions: fifth-wheel, official grain samples, transfer standard and Standard, Field 167

NIST OWM Executive Summary for Item Block 1 (B1) Terminology for Testing Standards 169

Item Block 2 (B2) - Define True Value for Use in Error Calculations 178

B2: A SCL-20.3 A S.5.4. Relationship of Minimum Load Cell Verification Interval to the Scale Division 178

B2: A SCL-20.4 A Table 3. Parameters of Accuracy Classes 178

B2: A SCL-20.5 A Table S.6.3.a. Marking Requirements, Note 3 178

B2: A SCL-20.6 A T.N.1.2. Accuracy Classes and T.N.1.3. Scale Division 178

B2: A SCL-20.7 A Table 7. Maintenance Tolerances 178

B2: A SCL-20.8 A Table 8. Recommended Minimum Load 178

NIST OWM Executive Summary for Item Block 2 (B2) - Define True Value for Use in Error Calculations 179

Item Block 3 (B3) - Tolerances for Distance Testing in Taximeters and Transportation Network Measurement Systems 205

B3: TXI-20.1 D T. Tolerances 205

B3: TNS-20.1 D T. Tolerances 205

NIST OWM Executive Summary for Item Block 3 (B3) - Tolerances for Distance Testing in Taximeters and Transportation Network Measurement Systems 205

Item Block 4 (B4) - Electronically Captured Tickets or Receipts 211

B4: GEN-21.2 D G-S.5.6. Recorded Representations 211

B4: LMD-21.2 D S.1.6.5. Money Value Computations., UR.3. Use of a Device 211

B4: VTM-21.1 D S.1.1. Primary Elements., UR.2. User Requirements 211

B4: LPG-21.1 D S.1.1. Primary Elements., UR.2. User Requirements 211

B4: CLM-21.1 D S.1.4.1. Printed Ticket Recorded Representation., UR.2.6.3. Printed Ticket Recorded Representation 211

B4: MLK-XX-X D S.1.4.2 Printed Ticket Recorded Representation., UR.2.2. Printed Ticket, Recorded Representation 211

B4: MFM-21.2D S.6. Printer Recorded Representations., UR.2.6. Ticket Printer, Customer Ticket, Recorded Representation., UR.3.4. Printed Ticket. Recorded Representation 212

B4: CDL-21.1 D S.1.4.1. Printed Ticket Recorded Representations., UR.2.4.2. Tickets or Invoices. Recorded Representation 212

B4: HGM-21.1D S.2.6. Recorded Representations, Point of Sale Systems., S.6. Printer. Recording Element., UR.3.2. Vehicle-mounted Measuring Systems Ticket Printer Recording Element., UR.3.3. Printed Ticket. Recorded Representation 212

B4: OTH-21.2 D Appendix D - Definitions.: recorded representations, recording element.212

NIST OWM Executive Summary for Item Block 4 (B4) - Electronically Captured Tickets or Receipts 212

Item Block 5 (B5) - Define "Field Reference Standard" 229

B5: CLM-18.2 W N.3.2. Transfer Standard Test and T.3. On Tests Using Transfer Standards. 229

B5: CDL-18.2 W N.3.2. Transfer Standard Test and T.3. On Tests Using Transfer Standards. 229

B5: HGM-18.2W N.4.1. Master Meter (Transfer) Standard Test and T.4. Tolerance Application on Test Using Transfer Standard Test Method 229

B5: OTH-18.3 W Appendix D - Definitions: field reference standard meter and transfer standard 229

Item Block 6 (B6) - Commercial and Law Enforcement, Axle and Axle Group Weights. 232

B6: SCL-22.1 D S.1.14. Recorded Representation of Axle or Axle Group Weights 232

B6: SCL-22.3 D UR.3.3. Single-Draft Vehicle Weighing., and UR.3.4. Axle and Axle Group Weight Values 233

NIST OWM Executive Summary for Item Block 6 (B6) -Commercial and Law Enforcement, Axle and Axle Group Weights 233

Item Block 7 (B7) Tolerances on Tests Using Transfer Standards 244

B7: CLM-22.1 D T.3. On Tests Using Type 2 Transfer Standards 244

B7: CDL-22.1 D T.3. On Tests Using Type 2 Transfer Standards 244

B7: HGM-22.1D T.4. Tolerance Application on Tests Using Type 2 Transfer Standard Test Method 244

NIST OWM Executive Summary for Item Block 7 (B7) - Tolerances on Tests Using Transfer Standards 244

Item Block 8 (B8) - G-T.5. Tolerances on Tests When Transfer Standards are Used., Appendix A, Section 3.2. Tolerances for Standards., and Appendix D - Definitions: standards, field., transfer standard, and standard, transfer. Appendix A: Fundamental Considerations, 3. Testing Apparatus 247

B8: GEN-19.1 D G-T.5. Tolerances on Tests When Transfer Standards are Used., Appendix A, Section 3.2. Tolerances for Standards., and Appendix D - Definitions: standards, field., transfer standard, and standard, transfer 247

B8: OTH-22.1 D Appendix A: Fundamental Considerations, 3. Testing Apparatus 247

NIST OWM Executive Summary for Item Block 8 (B8) - G-T.5. Tolerances on Tests When Transfer Standards Are Used, Appendix A, Section 3.2. Tolerances for Standards., and Appendix D - Definitions: Standards, Field., and Standard, Transfer. Appendix A: Fundamental Considerations, 3. Testing Apparatus 250

References: 265

Appendix A. S&T Supplemental Documents: 265

Appendix B. List of Symbols, Abbreviations and Acronyms 455

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